ov8830: adjust exposure time to prevent over-exposure in office

ov8830: adjust exposure time to prevent over-exposure in office

BZ: 26645

Adjust exposure time for typical office day environment.

Change-Id: Iba071287c26cd40c047f08abf28f54d3ad7f03b4
Signed-off-by: Tuukka Toivonen <tuukka.toivonen@intel.com>
Reviewed-on: http://android.intel.com:8080/37843
Reviewed-by: Monroy, German <german.monroy@intel.com>
Reviewed-by: Koski, Anttu <anttu.koski@intel.com>
Tested-by: Koski, Anttu <anttu.koski@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>